I believe shooting heavy loads are apt to expose any deficiencies in the shotguns...especially a rough chamber. Rough chambers are much more likely to show themselves with heavy loads upon extraction. I think it's because of the pressure expenditure.
I don't recommend not cleaning the receiver at all, just during the break in period. I clean the barrel and not the receiver in order to avoid corrosion and pitting. I believe it's more susceptible than the receiver. I also feel the added gunk and carbon build up will help smoothe out the bolt, action bars, elevator, etc.
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